Soft-Ground Tunnel: Forces: The heavy, wet ground pushes on all sides of the tunnel. The tunnel's walls are squeezed by the ground.
Discussion Questions-
1.
Where are tunnels usually constructed? Think of different types of tunnels, such as those under water, under land, or through a mountain. Why are such tunnels constructed? What benefits do they serve?
2.
Why do major tunnel projects take so many years to complete?
3.
What are some of the challenges involved in trying to dig through a mountain using a tunnel boring machine (TBM)?
4.
Research a tunnel located in your area. Try to find out the estimated number of cars and trucks that pass through it each day.
5.
What health hazards do tunnel construction workers face?
6.
What precautions can tunnel builders take to prevent injury or death as they work underground?
Time Tunnel Game
Soft-Ground Tunnel: Forces: The heavy, wet ground pushes on all sides of the tunnel. The tunnel's walls are squeezed by the ground.
Discussion Questions-